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freeipa/ipaserver/install/krbinstance.py
Timo Aaltonen b793c9049e Fix kdc.conf.template to use ipaplatform.paths. 
https://fedorahosted.org/freeipa/ticket/5343

Reviewed-By: David Kupka <dkupka@redhat.com>
2016-03-23 13:35:29 +01:00

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Python
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# Authors: Simo Sorce <ssorce@redhat.com>
#
# Copyright (C) 2007 Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
from __future__ import absolute_import
from __future__ import print_function
import shutil
import os
import pwd
import socket
import dns.name
from ipaserver.install import service
from ipaserver.install import installutils
from ipapython import sysrestore
from ipapython import ipautil
from ipapython import kernel_keyring
from ipalib.constants import CACERT
from ipapython.ipa_log_manager import root_logger
from ipapython.dn import DN
from ipaserver.install import replication
from ipaserver.install import ldapupdate
from ipaserver.install import certs
from distutils import version
from ipaplatform.constants import constants
from ipaplatform.tasks import tasks
from ipaplatform.paths import paths
class KpasswdInstance(service.SimpleServiceInstance):
def __init__(self):
service.SimpleServiceInstance.__init__(self, "kadmin")
class KrbInstance(service.Service):
def __init__(self, fstore=None):
service.Service.__init__(self, "krb5kdc", service_desc="Kerberos KDC")
self.fqdn = None
self.realm = None
self.domain = None
self.host = None
self.admin_password = None
self.master_password = None
self.suffix = None
self.subject_base = None
self.kdc_password = None
self.sub_dict = None
self.pkcs12_info = None
if fstore:
self.fstore = fstore
else:
self.fstore = sysrestore.FileStore(paths.SYSRESTORE)
suffix = ipautil.dn_attribute_property('_suffix')
subject_base = ipautil.dn_attribute_property('_subject_base')
def get_realm_suffix(self):
return DN(('cn', self.realm), ('cn', 'kerberos'), self.suffix)
def move_service_to_host(self, principal):
"""
Used to move a host/ service principal created by kadmin.local from
cn=kerberos to reside under the host entry.
"""
service_dn = DN(('krbprincipalname', principal), self.get_realm_suffix())
service_entry = self.admin_conn.get_entry(service_dn)
self.admin_conn.delete_entry(service_entry)
# Create a host entry for this master
host_dn = DN(
('fqdn', self.fqdn), ('cn', 'computers'), ('cn', 'accounts'),
self.suffix)
host_entry = self.admin_conn.make_entry(
host_dn,
objectclass=[
'top', 'ipaobject', 'nshost', 'ipahost', 'ipaservice',
'pkiuser', 'krbprincipalaux', 'krbprincipal',
'krbticketpolicyaux', 'ipasshhost'],
krbextradata=service_entry['krbextradata'],
krblastpwdchange=service_entry['krblastpwdchange'],
krbprincipalname=service_entry['krbprincipalname'],
krbprincipalkey=service_entry['krbprincipalkey'],
serverhostname=[self.fqdn.split('.',1)[0]],
cn=[self.fqdn],
fqdn=[self.fqdn],
ipauniqueid=['autogenerate'],
managedby=[host_dn],
)
if 'krbpasswordexpiration' in service_entry:
host_entry['krbpasswordexpiration'] = service_entry[
'krbpasswordexpiration']
if 'krbticketflags' in service_entry:
host_entry['krbticketflags'] = service_entry['krbticketflags']
self.admin_conn.add_entry(host_entry)
# Add the host to the ipaserver host group
ld = ldapupdate.LDAPUpdate(ldapi=True)
ld.update([os.path.join(paths.UPDATES_DIR,
'20-ipaservers_hostgroup.update')])
def __common_setup(self, realm_name, host_name, domain_name, admin_password):
self.fqdn = host_name
self.realm = realm_name.upper()
self.host = host_name.split(".")[0]
self.ip = socket.getaddrinfo(host_name, None, socket.AF_UNSPEC, socket.SOCK_STREAM)[0][4][0]
self.domain = domain_name
self.suffix = ipautil.realm_to_suffix(self.realm)
self.kdc_password = ipautil.ipa_generate_password()
self.admin_password = admin_password
self.dm_password = admin_password
self.__setup_sub_dict()
# get a connection to the DS
self.ldap_connect()
self.backup_state("running", self.is_running())
try:
self.stop()
except Exception:
# It could have been not running
pass
def __common_post_setup(self):
self.step("starting the KDC", self.__start_instance)
self.step("configuring KDC to start on boot", self.__enable)
def create_instance(self, realm_name, host_name, domain_name, admin_password, master_password, setup_pkinit=False, pkcs12_info=None, subject_base=None):
self.master_password = master_password
self.pkcs12_info = pkcs12_info
self.subject_base = subject_base
self.__common_setup(realm_name, host_name, domain_name, admin_password)
self.step("adding kerberos container to the directory", self.__add_krb_container)
self.step("configuring KDC", self.__configure_instance)
self.step("initialize kerberos container", self.__init_ipa_kdb)
self.step("adding default ACIs", self.__add_default_acis)
self.step("creating a keytab for the directory", self.__create_ds_keytab)
self.step("creating a keytab for the machine", self.__create_host_keytab)
self.step("adding the password extension to the directory", self.__add_pwd_extop_module)
if setup_pkinit:
self.step("creating X509 Certificate for PKINIT", self.__setup_pkinit)
self.step("creating principal for anonymous PKINIT", self.__add_anonymous_pkinit_principal)
self.__common_post_setup()
self.start_creation(runtime=30)
self.kpasswd = KpasswdInstance()
self.kpasswd.create_instance('KPASSWD', self.fqdn, self.admin_password, self.suffix, realm=self.realm)
def create_replica(self, realm_name,
master_fqdn, host_name,
domain_name, admin_password,
setup_pkinit=False, pkcs12_info=None,
subject_base=None, promote=False):
self.pkcs12_info = pkcs12_info
self.subject_base = subject_base
self.master_fqdn = master_fqdn
self.__common_setup(realm_name, host_name, domain_name, admin_password)
self.step("configuring KDC", self.__configure_instance)
if not promote:
self.step("creating a keytab for the directory",
self.__create_ds_keytab)
self.step("creating a keytab for the machine",
self.__create_host_keytab)
self.step("adding the password extension to the directory", self.__add_pwd_extop_module)
if setup_pkinit:
self.step("installing X509 Certificate for PKINIT", self.__setup_pkinit)
if not promote:
self.step("enable GSSAPI for replication",
self.__convert_to_gssapi_replication)
self.__common_post_setup()
self.start_creation(runtime=30)
self.kpasswd = KpasswdInstance()
self.kpasswd.create_instance('KPASSWD', self.fqdn, self.admin_password, self.suffix)
def __enable(self):
self.backup_state("enabled", self.is_enabled())
# We do not let the system start IPA components on its own,
# Instead we reply on the IPA init script to start only enabled
# components as found in our LDAP configuration tree
self.ldap_enable('KDC', self.fqdn, self.admin_password, self.suffix)
def __start_instance(self):
try:
self.start()
except Exception:
root_logger.critical("krb5kdc service failed to start")
def __setup_sub_dict(self):
self.sub_dict = dict(FQDN=self.fqdn,
IP=self.ip,
PASSWORD=self.kdc_password,
SUFFIX=self.suffix,
DOMAIN=self.domain,
HOST=self.host,
SERVER_ID=installutils.realm_to_serverid(self.realm),
REALM=self.realm,
KRB5KDC_KADM5_ACL=paths.KRB5KDC_KADM5_ACL,
DICT_WORDS=paths.DICT_WORDS,
KRB5KDC_KADM5_KEYTAB=paths.KRB5KDC_KADM5_KEYTAB,
KDC_PEM=paths.KDC_PEM,
CACERT_PEM=paths.CACERT_PEM)
# IPA server/KDC is not a subdomain of default domain
# Proper domain-realm mapping needs to be specified
domain = dns.name.from_text(self.domain)
fqdn = dns.name.from_text(self.fqdn)
if not fqdn.is_subdomain(domain):
root_logger.debug("IPA FQDN '%s' is not located in default domain '%s'",
fqdn, domain)
server_domain = fqdn.parent().to_unicode(omit_final_dot=True)
root_logger.debug("Domain '%s' needs additional mapping in krb5.conf",
server_domain)
dr_map = " .%(domain)s = %(realm)s\n %(domain)s = %(realm)s\n" \
% dict(domain=server_domain, realm=self.realm)
else:
dr_map = ""
self.sub_dict['OTHER_DOMAIN_REALM_MAPS'] = dr_map
# Configure KEYRING CCACHE if supported
if kernel_keyring.is_persistent_keyring_supported():
root_logger.debug("Enabling persistent keyring CCACHE")
self.sub_dict['OTHER_LIBDEFAULTS'] = \
" default_ccache_name = KEYRING:persistent:%{uid}\n"
else:
root_logger.debug("Persistent keyring CCACHE is not enabled")
self.sub_dict['OTHER_LIBDEFAULTS'] = ''
def __add_krb_container(self):
self._ldap_mod("kerberos.ldif", self.sub_dict)
def __add_default_acis(self):
self._ldap_mod("default-aci.ldif", self.sub_dict)
def __template_file(self, path, chmod=0o644):
template = os.path.join(ipautil.SHARE_DIR, os.path.basename(path) + ".template")
conf = ipautil.template_file(template, self.sub_dict)
self.fstore.backup_file(path)
fd = open(path, "w+")
fd.write(conf)
fd.close()
if chmod is not None:
os.chmod(path, chmod)
def __init_ipa_kdb(self):
# kdb5_util may take a very long time when entropy is low
installutils.check_entropy()
#populate the directory with the realm structure
args = ["kdb5_util", "create", "-s",
"-r", self.realm,
"-x", "ipa-setup-override-restrictions"]
dialogue = (
# Enter KDC database master key:
self.master_password + '\n',
# Re-enter KDC database master key to verify:
self.master_password + '\n',
)
try:
ipautil.run(args, nolog=(self.master_password,), stdin=''.join(dialogue))
except ipautil.CalledProcessError as e:
print("Failed to initialize the realm container")
def __configure_instance(self):
self.__template_file(paths.KRB5KDC_KDC_CONF, chmod=None)
self.__template_file(paths.KRB5_CONF)
self.__template_file(paths.HTML_KRB5_INI)
self.__template_file(paths.KRB_CON)
self.__template_file(paths.HTML_KRBREALM_CON)
MIN_KRB5KDC_WITH_WORKERS = "1.9"
cpus = os.sysconf('SC_NPROCESSORS_ONLN')
workers = False
result = ipautil.run(['klist', '-V'],
raiseonerr=False, capture_output=True)
if result.returncode == 0:
verstr = result.output.split()[-1]
ver = version.LooseVersion(verstr)
min = version.LooseVersion(MIN_KRB5KDC_WITH_WORKERS)
if ver >= min:
workers = True
# Write down config file
# We write realm and also number of workers (for multi-CPU systems)
replacevars = {'KRB5REALM':self.realm}
appendvars = {}
if workers and cpus > 1:
appendvars = {'KRB5KDC_ARGS': "'-w %s'" % str(cpus)}
ipautil.backup_config_and_replace_variables(self.fstore, paths.SYSCONFIG_KRB5KDC_DIR,
replacevars=replacevars,
appendvars=appendvars)
tasks.restore_context(paths.SYSCONFIG_KRB5KDC_DIR)
#add the password extop module
def __add_pwd_extop_module(self):
self._ldap_mod("pwd-extop-conf.ldif", self.sub_dict)
def __create_ds_keytab(self):
ldap_principal = "ldap/" + self.fqdn + "@" + self.realm
installutils.kadmin_addprinc(ldap_principal)
self.move_service(ldap_principal)
self.fstore.backup_file(paths.DS_KEYTAB)
installutils.create_keytab(paths.DS_KEYTAB, ldap_principal)
vardict = {"KRB5_KTNAME": paths.DS_KEYTAB}
ipautil.config_replace_variables(paths.SYSCONFIG_DIRSRV,
replacevars=vardict)
pent = pwd.getpwnam(constants.DS_USER)
os.chown(paths.DS_KEYTAB, pent.pw_uid, pent.pw_gid)
def __create_host_keytab(self):
host_principal = "host/" + self.fqdn + "@" + self.realm
installutils.kadmin_addprinc(host_principal)
self.fstore.backup_file(paths.KRB5_KEYTAB)
installutils.create_keytab(paths.KRB5_KEYTAB, host_principal)
# Make sure access is strictly reserved to root only for now
os.chown(paths.KRB5_KEYTAB, 0, 0)
os.chmod(paths.KRB5_KEYTAB, 0o600)
self.move_service_to_host(host_principal)
def __setup_pkinit(self):
ca_db = certs.CertDB(self.realm, host_name=self.fqdn,
subject_base=self.subject_base)
if self.pkcs12_info:
ca_db.install_pem_from_p12(self.pkcs12_info[0],
self.pkcs12_info[1],
paths.KDC_PEM)
else:
raise RuntimeError("PKI not supported yet\n")
# Finally copy the cacert in the krb directory so we don't
# have any selinux issues with the file context
shutil.copyfile(CACERT, paths.CACERT_PEM)
def __add_anonymous_pkinit_principal(self):
princ = "WELLKNOWN/ANONYMOUS"
princ_realm = "%s@%s" % (princ, self.realm)
# Create the special anonymous principal
installutils.kadmin_addprinc(princ_realm)
dn = DN(('krbprincipalname', princ_realm), self.get_realm_suffix())
entry = self.admin_conn.get_entry(dn)
entry['nsAccountlock'] = ['TRUE']
self.admin_conn.update_entry(entry)
def __convert_to_gssapi_replication(self):
repl = replication.ReplicationManager(self.realm,
self.fqdn,
self.dm_password)
repl.convert_to_gssapi_replication(self.master_fqdn,
r_binddn=DN(('cn', 'Directory Manager')),
r_bindpw=self.dm_password)
def uninstall(self):
if self.is_configured():
self.print_msg("Unconfiguring %s" % self.service_name)
running = self.restore_state("running")
enabled = self.restore_state("enabled")
try:
self.stop()
except Exception:
pass
for f in [paths.KRB5KDC_KDC_CONF, paths.KRB5_CONF]:
try:
self.fstore.restore_file(f)
except ValueError as error:
root_logger.debug(error)
# disabled by default, by ldap_enable()
if enabled:
self.enable()
if running:
self.restart()
self.kpasswd = KpasswdInstance()
self.kpasswd.uninstall()
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